Machine for dressing and pecking grindstones



(No Model.)

' H. B. ROBISCHUNG. MACHINE NoN DRESSING AND PNGNING G-NINDsToNNs.

No. 548,272. Paten-ted 00h22, 1895.

l UNITED l STATES PATENT OFFICE.

HENRY B. ROBISCHUNG, OF` KALAMAZOO, MICHIGAN, ASSIGNKOR TO EDWARD B.LEIGH, OFYCHICAGO, ILLINOIS.

IVIACHINE FONR DRESSING AND' PECKING GRINDSTONES.

SPECIFICATION forming part ef Letters atent No. 548,272, dated october22, 1895. Appncation nea Apre 1, `1895. serai no, 544,045. (No maar.)

To all whom t may concern..

Be it known that I, HENRY B. RoBIsCHUNG, a citizen of the United States,residing at Kalamazoo, in the county f Kalamazoo, State of Michigan,have invented certain new and useful Improvements in Machines forDressing and Pecking Grindstones; and I hereby declare the following tobe a full, clear, and exact description of the same, reference being hadto the accompanying drawings, in which- Figure 1 is a side elevationof amachine embodying my invention shown as mounted on the frame of agrindstone and in position for dressing the stone. Fig. 2 is a detachedend view of the machine, looking toward the grindstone, grindstoneomitted. Fig. 3 is a top or plan view ofthe machine'. Fig. 4: is acentral vertical section, the tool-rest omitted. Fig. 5 is a side view,and Fig. 6 an end view, of the disk-sleeve; and Fig. 7 is an enlargeddetail view of two of the disks, showing the teeth alternating or inposition for pecking. Like symbols refer to like parts wherever theyoccur.

My invention relates to the construction of a simple and efcient machinefor dressing and-pecking the face or periphery of a revolving stone.

As is well understood, in the use of grindstones for grinding tools,especially if the stone is of unequal hardness or the tools toV beground vary in size and shape, the opera-` tive face of the stonebecomes uneven and irregular and requires frequent dressing or truingand equally if not more frequent pecking or sharpening. These severaloperations are commonly performed by separate and distincthandjvQglLQILsometimes by distinct Inachines which are appliedto andremoved from the stone as each separate operation is required to beperformed.

The objects of my presentinvention are, rst, the production of a simpleand efficient convertible dresser and pick, and, second, itsconstruction in such form as will permit, if desired, of itspractically-permanent attach-l ment to the grindstone where it isrequired and can be utilized without loss of time, in terruption of theuse of the stone, or hampering the workman.

To this end the main feature of my invention embraces the combination ofa series of serrated revoluble disks and means for causing theserrations to register and to alternate for either dressing or peckingthe stone, as may be required.

A secondary feature of the invention embraces the means by which thesame is accomplished-that is to say, the combination, 6o with a splinedsleeve, of a series of annular serrated disks, each having aspline-notch on one side of the diametric line of lthe disk, whichintersects the tooth on the periphery of the disk, whereby the reversingof alternatedisks will stagger the cutting-teeth.

There are other minor features of invention, all as will hereinaftermore fully appear.

I will now proceed to describe my invention more fully, so that othersskilled in the art to 7o which it appertains may apply the same.

Upon asuitable frame Aisjournaled agrindstone B, which may be rotated inany known manner and from which the power is taken for operating thedressing and pecking tool. Either formed on or attached to said frame A,in line with and opposite the periphery of the stone B, are suitableWays C, in which moves to and from the periphery of the stoneB q a slideor bed-plate D, which may be advanced 8o and Withdrawn by the usualfeed-screw E or any equivalent mechanism. Erected on and at the forwardend of slide or bed-plate D are pedestals F F, in which is detachablysecured by clamps ffor otherwise a'shaft Gr,- on which 85 rotates asleeve l. This sleeve 1 is somewhat less in length than the distancebetween the pedestals F F, so as to be capable of an endwise movement onthe shaft G as well as rotation thereon, and is provided on its interior9( with a series of annular grooves l@ (see Fig.

4, also dotted lines, Fig. 5) to retain a lubricant. The sleeve lhasafixed collar 2 at one end and is threaded at the other for the receptionof a threaded collar or nut 3, while a longitudinal spline v4f extendsthe length of the sleeve.

5 5 indicate a Vseries of annular disks having serrated peripheries,said disks being of equal diameter and having va uniform numroo ber ofteeth, whereby said disks may be so arranged on the sleeve l that theirteeth may registerwith each other or may be staggered, dodged, oralternated, according to the work to be done. I prefer to accomplishthis by the arrangement or location of a slot, a perforation, or aspline-notch 6, which I place a little to one side of a line drawn fromthe center of the disk to the point'of a tooth, (see Fig. 7,) thereaftersecuring the disks to move together with the teeth arranged in line orstaggered, as desired, by means of a rod, a key, or a spline 4, as thecase may be.

7 indicates a loose sliding collar provided with a grooved periphery forthe reception of a pin on one arm ot a shipping-lever 8, which pin maybe provided with an antifrictionroller, if desired.

` Erected on the slide or movable bed-plate D, in rear of pedestals F F,are other and taller pedestals 9 9, to which is attached the table 10,the whole constituting a tool-rest which extends toward the grindstoneand over the serrated disks 5 5, so as to house the same, and thusenable both sides of the stone to be used without removing the dresser.

The construction of the several parts of the machine being of thegeneral character hereinbefore specified, the ways C will be attached tothe frame of the grindstone. The slide or bed-plate D, carrying thetool-rest and pedestals F F, will be arranged in the ways C andconnected with feedscrew E. The serrated disks 5 5 will be arranged withthe splinenotches registering and the peripheral teeth in line, and thenslipped on the sleeve l, t0 gether with the loose grooved collar 7, andthe whole secured by the threaded collar or nut 3. The shaft G will thenbe passed through the sleeve l and secured at its ends in pedestals F F,the pin of the shipping-lever 8 resting in the groove of collar 7, andthe machine so set up will act effectively as a dresser when theserrated disks 5 5 are brought in operative contact with the grindstoneA, from which they receive their motion. During the operation of thetool as a dresser it may be caused to vibrate or travel back and forthtransversely of the periphery of the stone by vibrating theshipping-lever 8.

To convert the device into a pick for s harpening the stone, all that isrequired is to loosen the clamps ff, remove the shaft G,with sleeve land disks, from the machine, remove the nut 3, and reverse every secondserrated disk, which will stagger the teeth ot the disks, tighten up nut3, replace shaft G, and again clamp the shaft to pillars F F, all ofwhich will require but little time and will not materially interrupt theuse of the grindstone.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

l. In a dressing and pecking machine, the combination with a series ofserrated revoluble disks, of means for locking said serrations in eitherregister or stagger form, substantially as and for the purposesspeciiied.

2. In a convertible dressing and pecking machine, the combination with aseries of uniformly serrated disks each of which has a slot located toone side of a radial line drawn from the point of a tooth,of a key forlocking the disks together, substantially as and for the purposesspccilied.

3. In a dressing and pecking machine, the combination with a series ofserrated annular disks each of which has a spline notch located to oneside of a radial line drawn from the point of a tooth, of a sleevehaving a longitudinal spline with which the spline notches of theserrated disks engage, substantially as and for the purposes specified.

4. In a dressing and pecking machine, the combination with a series ofserrated annular disks each having a spline notch located to one side ofa radial line drawn from the point of a tooth, of a splined sleeve,means for detachably securing the disks on said sleeve, and a shaft onwhich said sleeve is loosely mounted, substantially as and for thepurposes specified.

5. In a convertible dressing and pecking machine, the combination with aseries of uniformly serrated disks each of which has a slot located toone side of a radial line drawn from the point of a tooth, of a sleeveon which said disks are detachably mounted, and means for keying orlocking the disks together and to the sleeve; substantially as and forthe purposes specified.

In testimony whereof I ai'lix my signature, in presence of twowitnesses, this 29th day of March, 1895.

HENRY B. ROBISCHUNG.

Witnesses:

E. T. WALKER, E. B. LEIGH.

IOO

